kehuduan.c

基于ＵＮＩＸ平台的ＴＣＰ／ＩＰ协议的通信程序设计,能将键盘上输入的数据发送到另一台计算机上；能将接收到的数据显示到屏幕窗口内；

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define SERVPORT 3333
#define MAXDATASIZE 100
void strcli(FILE *,int); //************jia fan hao
int main(int argc,char *argv[]){
    int sockfd;
    struct hostent *host;
    struct sockaddr_in serv_addr;
    if(argc < 2){
        fprintf(stderr,"Please enter the server's hostname!\n");
        exit(1);
    }
    if((host=gethostbyname(argv[1]))==NULL){
        perror("gethostbyname");
        exit(1);
    }
    if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1){
        perror("socket");
        exit(1);
    }
    serv_addr.sin_family=AF_INET;
    serv_addr.sin_port=htons(SERVPORT);
    serv_addr.sin_addr=*((struct in_addr *)host->h_addr_list[0]);
    bzero(&(serv_addr.sin_zero),8);
    if(connect(sockfd,(struct sockaddr *)&serv_addr,\
        sizeof(struct sockaddr))==-1){
        perror("connect");
        exit(1);
    }
  strcli(stdin,sockfd);
close(sockfd);
}

void strcli(FILE *fp,int sockfd)
{
    char sends[MAXDATASIZE],buf[MAXDATASIZE];
    int recvbytes;
    while(1)
   {  printf("Please input words\n");
     if(fgets(sends,MAXDATASIZE,fp)!=NULL)
       {
          send(sockfd,sends,strlen(sends)+1,0);
          printf("sent to server:%s\n");
        }
     if((recvbytes=recv(sockfd,buf,MAXDATASIZE,0))!=-1)
      {
             buf[recvbytes]='\0';
         printf("received from server:%s\n",buf);
         }
   }
      
 }